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phiBest ResponseYou've already chosen the best response.0
is ABCD a parallelogram or a rhombus?
 one year ago

tamtoanBest ResponseYou've already chosen the best response.1
the figure is not drawn to scale, so it's harder to see let me draw again and you can check to see if i am right. dw:1355076484153:dw
 one year ago

tamtoanBest ResponseYou've already chosen the best response.1
BD is perpendicular to AC since they are diagonals of a rhombus look at triangle ABD, the area is ABxDH = BDx(AC/2) since AC/2 = DH ==> AB = BD and since AB = AD also, (rhombus), triangle ABD have 3 sides equal, (they are called equalateral triangle right?), each angle is 60 degree so angle ABC = 2x60 = 120
 one year ago
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